mirror of https://gitee.com/openkylin/linux.git
V4L/DVB (8232): gspca: Change the USERPTR mechanism.
main: Change the packet copy mechanism for userptr.
Cannot do reqbufs ioctl when already done and count != 0.
Accept count < frame size in read().
Signed-off-by: Jean-Francois Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
This commit is contained in:
Jean-Francois Moine
Mauro Carvalho Chehab
parent
c41492c89a
commit
ac0d6df69b
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@ -36,15 +36,14 @@
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#include "gspca.h"
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/* global values */
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#define DEF_NURBS 2 /* default number of URBs (mmap) */
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#define USR_NURBS 5 /* default number of URBs (userptr) */
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#define DEF_NURBS 2 /* default number of URBs */
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MODULE_AUTHOR("Jean-Francois Moine <http://moinejf.free.fr>");
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MODULE_DESCRIPTION("GSPCA USB Camera Driver");
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MODULE_LICENSE("GPL");
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#define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 1, 5)
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static const char version[] = "2.1.5";
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#define DRIVER_VERSION_NUMBER KERNEL_VERSION(2, 1, 6)
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static const char version[] = "2.1.6";
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static int video_nr = -1;
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@ -153,7 +152,6 @@ static void fill_frame(struct gspca_dev *gspca_dev,
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}
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/* resubmit the URB */
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/*fixme: don't do that when userptr and too many URBs sent*/
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urb->status = 0;
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st = usb_submit_urb(urb, GFP_ATOMIC);
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if (st < 0)
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@ -163,18 +161,9 @@ static void fill_frame(struct gspca_dev *gspca_dev,
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/*
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* ISOC message interrupt from the USB device
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*
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* Analyse each packet and call the subdriver for copy
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* to the frame buffer.
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*
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* There are 2 functions:
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* - the first one (isoc_irq_mmap) is used when the application
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* buffers are mapped. The frame detection and copy is done
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* at interrupt level.
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* - the second one (isoc_irq_user) is used when the application
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* buffers are in user space (userptr). The frame detection
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* and copy is done by the application.
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* Analyse each packet and call the subdriver for copy to the frame buffer.
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*/
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static void isoc_irq_mmap(struct urb *urb
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static void isoc_irq(struct urb *urb
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)
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{
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struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
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@ -185,56 +174,11 @@ static void isoc_irq_mmap(struct urb *urb
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fill_frame(gspca_dev, urb);
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}
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static void isoc_irq_user(struct urb *urb
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)
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{
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struct gspca_dev *gspca_dev = (struct gspca_dev *) urb->context;
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int i;
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PDEBUG(D_PACK, "isoc irq user");
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if (!gspca_dev->streaming)
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return;
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i = gspca_dev->urb_in % gspca_dev->nurbs;
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if (urb != gspca_dev->urb[i]) {
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PDEBUG(D_ERR|D_PACK, "urb out of sequence");
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return; /* should never occur */
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}
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gspca_dev->urb_in++;
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atomic_inc(&gspca_dev->nevent); /* new event */
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wake_up_interruptible(&gspca_dev->wq);
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/*fixme: submit a new URBs until urb_in == urb_out (% nurbs)*/
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}
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/*
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* treat the isoc messages
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*
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* This routine is called by the application (case userptr).
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*/
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static void isoc_transfer(struct gspca_dev *gspca_dev)
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{
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struct urb *urb;
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int i;
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for (;;) {
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i = gspca_dev->urb_out;
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PDEBUG(D_PACK, "isoc transf i:%d o:%d", gspca_dev->urb_in, i);
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if (i == gspca_dev->urb_in) /* isoc message to read */
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break; /* no (more) message */
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atomic_dec(&gspca_dev->nevent);
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/*PDEBUG(D_PACK, "isoc_trf nevent: %d", atomic_read(&gspca_dev->nevent));*/
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gspca_dev->urb_out = i + 1; /* message treated */
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urb = gspca_dev->urb[i % gspca_dev->nurbs];
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fill_frame(gspca_dev, urb);
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}
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}
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/*
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* add data to the current frame
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*
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* This function is called by the subdrivers at interrupt level
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* or user level.
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* This function is called by the subdrivers at interrupt level.
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*
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* To build a frame, these ones must add
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* - one FIRST_PACKET
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* - 0 or many INTER_PACKETs
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@ -277,16 +221,7 @@ struct gspca_frame *gspca_frame_add(struct gspca_dev *gspca_dev,
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frame->v4l2_buf.length);
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packet_type = DISCARD_PACKET;
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} else {
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if (frame->v4l2_buf.memory != V4L2_MEMORY_USERPTR) {
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memcpy(frame->data_end, data, len);
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} else {
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if (copy_to_user(frame->data_end,
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data, len) != 0) {
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PDEBUG(D_ERR|D_PACK,
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"copy to user failed");
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packet_type = DISCARD_PACKET;
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}
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}
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memcpy(frame->data_end, data, len);
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frame->data_end += len;
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}
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}
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@ -333,7 +268,6 @@ static void *rvmalloc(unsigned long size)
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/* size = PAGE_ALIGN(size); (already done) */
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mem = vmalloc_32(size);
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if (mem != NULL) {
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memset(mem, 0, size);
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adr = (unsigned long) mem;
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while ((long) size > 0) {
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SetPageReserved(vmalloc_to_page((void *) adr));
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@ -344,14 +278,12 @@ static void *rvmalloc(unsigned long size)
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return mem;
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}
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static void rvfree(void *mem, unsigned long size)
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static void rvfree(void *mem, long size)
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{
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unsigned long adr;
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if (!mem)
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return;
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adr = (unsigned long) mem;
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while ((long) size > 0) {
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while (size > 0) {
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ClearPageReserved(vmalloc_to_page((void *) adr));
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adr += PAGE_SIZE;
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size -= PAGE_SIZE;
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@ -370,16 +302,13 @@ static int frame_alloc(struct gspca_dev *gspca_dev,
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frsz = gspca_dev->cam.cam_mode[i].sizeimage;
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PDEBUG(D_STREAM, "frame alloc frsz: %d", frsz);
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frsz = PAGE_ALIGN(frsz);
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PDEBUG(D_STREAM, "new fr_sz: %d", frsz);
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gspca_dev->frsz = frsz;
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if (count > GSPCA_MAX_FRAMES)
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count = GSPCA_MAX_FRAMES;
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if (gspca_dev->memory == V4L2_MEMORY_MMAP) {
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gspca_dev->frbuf = rvmalloc(frsz * count);
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if (!gspca_dev->frbuf) {
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err("frame alloc failed");
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return -ENOMEM;
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}
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gspca_dev->frbuf = rvmalloc(frsz * count);
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if (!gspca_dev->frbuf) {
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err("frame alloc failed");
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return -ENOMEM;
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}
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gspca_dev->nframes = count;
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for (i = 0; i < count; i++) {
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@ -391,11 +320,9 @@ static int frame_alloc(struct gspca_dev *gspca_dev,
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frame->v4l2_buf.length = frsz;
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frame->v4l2_buf.memory = gspca_dev->memory;
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frame->v4l2_buf.sequence = 0;
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if (gspca_dev->memory == V4L2_MEMORY_MMAP) {
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frame->data = frame->data_end =
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frame->data = frame->data_end =
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gspca_dev->frbuf + i * frsz;
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frame->v4l2_buf.m.offset = i * frsz;
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}
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frame->v4l2_buf.m.offset = i * frsz;
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}
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gspca_dev->fr_i = gspca_dev->fr_o = gspca_dev->fr_q = 0;
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gspca_dev->last_packet_type = DISCARD_PACKET;
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@ -509,7 +436,6 @@ static int create_urbs(struct gspca_dev *gspca_dev,
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{
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struct urb *urb;
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int n, nurbs, i, psize, npkt, bsize;
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usb_complete_t usb_complete;
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/* calculate the packet size and the number of packets */
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psize = le16_to_cpu(ep->desc.wMaxPacketSize);
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@ -522,14 +448,7 @@ static int create_urbs(struct gspca_dev *gspca_dev,
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bsize = psize * npkt;
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PDEBUG(D_STREAM,
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"isoc %d pkts size %d (bsize:%d)", npkt, psize, bsize);
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/*fixme:don't submit all URBs when userptr*/
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if (gspca_dev->memory != V4L2_MEMORY_USERPTR) {
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usb_complete = isoc_irq_mmap;
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nurbs = DEF_NURBS;
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} else {
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usb_complete = isoc_irq_user;
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nurbs = USR_NURBS;
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}
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nurbs = DEF_NURBS;
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gspca_dev->nurbs = nurbs;
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for (n = 0; n < nurbs; n++) {
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urb = usb_alloc_urb(npkt, GFP_KERNEL);
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@ -556,7 +475,7 @@ static int create_urbs(struct gspca_dev *gspca_dev,
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urb->transfer_flags = URB_ISO_ASAP
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| URB_NO_TRANSFER_DMA_MAP;
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urb->interval = ep->desc.bInterval;
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urb->complete = usb_complete;
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urb->complete = isoc_irq;
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urb->number_of_packets = npkt;
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urb->transfer_buffer_length = bsize;
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for (i = 0; i < npkt; i++) {
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@ -564,7 +483,6 @@ static int create_urbs(struct gspca_dev *gspca_dev,
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urb->iso_frame_desc[i].offset = psize * i;
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}
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}
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gspca_dev->urb_in = gspca_dev->urb_out = 0;
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return 0;
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}
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@ -1063,6 +981,7 @@ static int vidioc_reqbufs(struct file *file, void *priv,
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if (rb->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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return -EINVAL;
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switch (rb->memory) {
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case GSPCA_MEMORY_READ:
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case V4L2_MEMORY_MMAP:
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case V4L2_MEMORY_USERPTR:
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break;
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@ -1072,13 +991,6 @@ static int vidioc_reqbufs(struct file *file, void *priv,
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if (mutex_lock_interruptible(&gspca_dev->queue_lock))
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return -ERESTARTSYS;
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for (i = 0; i < gspca_dev->nframes; i++) {
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if (gspca_dev->frame[i].vma_use_count) {
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ret = -EBUSY;
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goto out;
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}
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}
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/* only one file may do capture */
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if ((gspca_dev->capt_file != NULL && gspca_dev->capt_file != file)
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|| gspca_dev->streaming) {
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@ -1086,10 +998,20 @@ static int vidioc_reqbufs(struct file *file, void *priv,
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goto out;
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}
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if (rb->count == 0) { /* unrequest? */
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if (rb->count == 0) { /* unrequest */
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for (i = 0; i < gspca_dev->nframes; i++) {
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if (gspca_dev->frame[i].vma_use_count) {
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ret = -EBUSY;
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goto out;
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}
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}
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frame_free(gspca_dev);
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gspca_dev->capt_file = NULL;
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} else {
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if (gspca_dev->nframes != 0) {
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ret = -EBUSY;
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goto out;
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}
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gspca_dev->memory = rb->memory;
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ret = frame_alloc(gspca_dev, rb->count);
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if (ret == 0) {
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@ -1301,9 +1223,6 @@ static int dev_mmap(struct file *file, struct vm_area_struct *vma)
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struct page *page;
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unsigned long addr, start, size;
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int i, ret;
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#ifdef CONFIG_VIDEO_V4L1_COMPAT
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int compat = 0;
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#endif
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start = vma->vm_start;
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size = vma->vm_end - vma->vm_start;
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@ -1338,11 +1257,11 @@ static int dev_mmap(struct file *file, struct vm_area_struct *vma)
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goto out;
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}
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#ifdef CONFIG_VIDEO_V4L1_COMPAT
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if (i == 0 && size == frame->v4l2_buf.length * gspca_dev->nframes)
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compat = 1;
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else
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/* v4l1 maps all the buffers */
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if (i != 0
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|| size != frame->v4l2_buf.length * gspca_dev->nframes)
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#endif
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if (size != frame->v4l2_buf.length) {
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if (size != frame->v4l2_buf.length) {
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PDEBUG(D_STREAM, "mmap bad size");
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ret = -EINVAL;
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goto out;
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@ -1368,14 +1287,6 @@ static int dev_mmap(struct file *file, struct vm_area_struct *vma)
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vma->vm_ops = &gspca_vm_ops;
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vma->vm_private_data = frame;
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gspca_vm_open(vma);
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#ifdef CONFIG_VIDEO_V4L1_COMPAT
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if (compat) {
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/*fixme: ugly*/
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for (i = 1; i < gspca_dev->nframes; ++i)
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gspca_dev->frame[i].v4l2_buf.flags |=
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V4L2_BUF_FLAG_MAPPED;
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}
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#endif
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ret = 0;
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out:
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mutex_unlock(&gspca_dev->queue_lock);
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@ -1393,10 +1304,6 @@ static int frame_wait(struct gspca_dev *gspca_dev,
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struct gspca_frame *frame;
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int i, j, ret;
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/* if userptr, treat the awaiting URBs */
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if (gspca_dev->memory == V4L2_MEMORY_USERPTR)
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isoc_transfer(gspca_dev);
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/* check if a frame is ready */
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i = gspca_dev->fr_o;
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j = gspca_dev->fr_queue[i];
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@ -1421,8 +1328,6 @@ static int frame_wait(struct gspca_dev *gspca_dev,
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atomic_dec(&gspca_dev->nevent);
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if (!gspca_dev->streaming || !gspca_dev->present)
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return -EIO;
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if (gspca_dev->memory == V4L2_MEMORY_USERPTR)
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isoc_transfer(gspca_dev);
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i = gspca_dev->fr_o;
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j = gspca_dev->fr_queue[i];
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frame = &gspca_dev->frame[j];
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@ -1455,9 +1360,9 @@ static int vidioc_dqbuf(struct file *file, void *priv,
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int i, ret;
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PDEBUG(D_FRAM, "dqbuf");
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if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE
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|| (v4l2_buf->memory != V4L2_MEMORY_MMAP
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&& v4l2_buf->memory != V4L2_MEMORY_USERPTR))
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if (v4l2_buf->type != V4L2_BUF_TYPE_VIDEO_CAPTURE)
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return -EINVAL;
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if (v4l2_buf->memory != gspca_dev->memory)
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return -EINVAL;
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if (!gspca_dev->streaming)
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return -EINVAL;
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@ -1475,6 +1380,16 @@ static int vidioc_dqbuf(struct file *file, void *priv,
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goto out;
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i = ret; /* frame index */
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frame = &gspca_dev->frame[i];
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if (gspca_dev->memory == V4L2_MEMORY_USERPTR) {
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if (copy_to_user((__u8 *) frame->v4l2_buf.m.userptr,
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frame->data,
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frame->v4l2_buf.bytesused)) {
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PDEBUG(D_ERR|D_STREAM,
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"dqbuf cp to user failed");
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ret = -EFAULT;
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goto out;
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}
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}
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frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE;
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memcpy(v4l2_buf, &frame->v4l2_buf, sizeof *v4l2_buf);
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PDEBUG(D_FRAM, "dqbuf %d", i);
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@ -1529,8 +1444,6 @@ static int vidioc_qbuf(struct file *file, void *priv,
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/* frame->v4l2_buf.flags &= ~V4L2_BUF_FLAG_DONE; */
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if (frame->v4l2_buf.memory == V4L2_MEMORY_USERPTR) {
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frame->data = frame->data_end =
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(__u8 *) v4l2_buf->m.userptr;
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frame->v4l2_buf.m.userptr = v4l2_buf->m.userptr;
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frame->v4l2_buf.length = v4l2_buf->length;
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}
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@ -1568,7 +1481,7 @@ static int read_alloc(struct gspca_dev *gspca_dev,
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memset(&rb, 0, sizeof rb);
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rb.count = gspca_dev->nbufread;
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rb.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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rb.memory = V4L2_MEMORY_MMAP;
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rb.memory = GSPCA_MEMORY_READ;
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ret = vidioc_reqbufs(file, gspca_dev, &rb);
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if (ret != 0) {
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PDEBUG(D_STREAM, "read reqbuf err %d", ret);
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@ -1576,7 +1489,7 @@ static int read_alloc(struct gspca_dev *gspca_dev,
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}
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memset(&v4l2_buf, 0, sizeof v4l2_buf);
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v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
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v4l2_buf.memory = V4L2_MEMORY_MMAP;
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v4l2_buf.memory = GSPCA_MEMORY_READ;
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for (i = 0; i < gspca_dev->nbufread; i++) {
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v4l2_buf.index = i;
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/*fixme: ugly!*/
|
||||
|
|
@ -1629,11 +1542,6 @@ static unsigned int dev_poll(struct file *file, poll_table *wait)
|
|||
goto out;
|
||||
}
|
||||
|
||||
/* if userptr, treat the awaiting URBs */
|
||||
if (gspca_dev->memory == V4L2_MEMORY_USERPTR
|
||||
&& gspca_dev->capt_file == file)
|
||||
isoc_transfer(gspca_dev);
|
||||
|
||||
i = gspca_dev->fr_o;
|
||||
i = gspca_dev->fr_queue[i];
|
||||
if (gspca_dev->frame[i].v4l2_buf.flags & V4L2_BUF_FLAG_DONE)
|
||||
|
|
@ -1678,7 +1586,7 @@ static ssize_t dev_read(struct file *file, char __user *data,
|
|||
for (;;) {
|
||||
memset(&v4l2_buf, 0, sizeof v4l2_buf);
|
||||
v4l2_buf.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
|
||||
v4l2_buf.memory = V4L2_MEMORY_MMAP;
|
||||
v4l2_buf.memory = GSPCA_MEMORY_READ;
|
||||
ret = vidioc_dqbuf(file, gspca_dev, &v4l2_buf);
|
||||
if (ret != 0) {
|
||||
PDEBUG(D_STREAM, "read dqbuf err %d", ret);
|
||||
|
|
@ -1700,14 +1608,8 @@ static ssize_t dev_read(struct file *file, char __user *data,
|
|||
}
|
||||
|
||||
/* copy the frame */
|
||||
if (count < frame->v4l2_buf.bytesused) {
|
||||
PDEBUG(D_STREAM, "read bad count: %d < %d",
|
||||
count, frame->v4l2_buf.bytesused);
|
||||
/*fixme: special errno?*/
|
||||
ret = -EINVAL;
|
||||
goto out;
|
||||
}
|
||||
count = frame->v4l2_buf.bytesused;
|
||||
if (count > frame->v4l2_buf.bytesused)
|
||||
count = frame->v4l2_buf.bytesused;
|
||||
ret = copy_to_user(data, frame->data, count);
|
||||
if (ret != 0) {
|
||||
PDEBUG(D_ERR|D_STREAM,
|
||||
|
|
|
|||
|
|
@ -156,8 +156,6 @@ struct gspca_dev {
|
|||
char nbufread; /* number of buffers for read() */
|
||||
char nurbs; /* number of allocated URBs */
|
||||
char memory; /* memory type (V4L2_MEMORY_xxx) */
|
||||
__u8 urb_in; /* URB pointers - used when !mmap */
|
||||
__u8 urb_out;
|
||||
__u8 nbalt; /* number of USB alternate settings */
|
||||
};
|
||||
|
||||
|
|
|
|||
Loading…
Reference in New Issue